<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Title</title>
  <style>
    div {
      text-decoration: underline;
    }
    p {
      text-decoration: line-through;
    }
    h2 {
      text-decoration: overline;
    }
    a {
      text-decoration: none;
    }
  </style>
</head>
<body>

<div>div</div>
<p>p</p>
<h2>h2</h2>
<a href="#">我是超链接，点呀</a>

</body>
</html>
